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Message-ID: <535C0AB0.7030509@linux.intel.com>
Date: Sat, 26 Apr 2014 12:36:16 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Jonathan Cameron <jic23@...nel.org>
CC: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald <pmeerw@...erw.net>
Subject: Re: [Patch v6 3/6] IIO: core: Modify scan element type
On 04/25/2014 11:02 AM, Jonathan Cameron wrote:
> On 15/04/14 19:21, Srinivas Pandruvada wrote:
>> The current scan element type uses the following format:
>> [be|le]:[s|u]bits/storagebits[>>shift].
>> To specify multiple elements in this type, added a repeat value.
>> So new format is:
>> [be|le]:[s|u]bits/storagebits{X[repeat]}[>>shift].
>> Here X is specifying how may times, real/storage bits are repeating.
>>
>> When X is value is 0 or 1, then repeat value is not used in the format,
>> and it will be same as existing format.
>>
>> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Hi Srinivas,
>
> I'm afraid I've been rather useless in my reviewing of earlier
> versions of this.
> What I originally meant to suggest was that we'd have descriptions
> along the lines
> of
> u12/16{X4}>>2 (or u12/16X4>>2 without the brackets) rather than
> u12/16{4repeat}>>2
I don't mind using u12/16X4>>2, will submit series again.
Thanks,
Srinivas
>
> Now obviously you've gone a long way with this approach so I guess
> perhaps people
> actually like the word repeat in there?
>
> Sorry again that I didn't pick up on this in any of the last 4
> versions you have posted.
> Sometimes the eye sees what it expects to rather than what is there!
>
> I don't particularly mind the version using the word 'repeat' if
> others like, it simply
> isn't what I thought we had here!
>
> (the rest of this series are fine now btw)
>
> J
>> ---
>> drivers/iio/industrialio-buffer.c | 41
>> +++++++++++++++++++++++++++++++++------
>> include/linux/iio/iio.h | 7 +++++++
>> 2 files changed, 42 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/iio/industrialio-buffer.c
>> b/drivers/iio/industrialio-buffer.c
>> index e108f2a..aa90c68 100644
>> --- a/drivers/iio/industrialio-buffer.c
>> +++ b/drivers/iio/industrialio-buffer.c
>> @@ -150,7 +150,16 @@ static ssize_t iio_show_fixed_type(struct device
>> *dev,
>> type = IIO_BE;
>> #endif
>> }
>> - return sprintf(buf, "%s:%c%d/%d>>%u\n",
>> + if (this_attr->c->scan_type.repeat > 1)
>> + return sprintf(buf, "%s:%c%d/%d{%d[repeat]}>>%u\n",
>> + iio_endian_prefix[type],
>> + this_attr->c->scan_type.sign,
>> + this_attr->c->scan_type.realbits,
>> + this_attr->c->scan_type.storagebits,
>> + this_attr->c->scan_type.repeat,
>> + this_attr->c->scan_type.shift);
>> + else
>> + return sprintf(buf, "%s:%c%d/%d>>%u\n",
>> iio_endian_prefix[type],
>> this_attr->c->scan_type.sign,
>> this_attr->c->scan_type.realbits,
>> @@ -474,14 +483,22 @@ static int iio_compute_scan_bytes(struct
>> iio_dev *indio_dev,
>> for_each_set_bit(i, mask,
>> indio_dev->masklength) {
>> ch = iio_find_channel_from_si(indio_dev, i);
>> - length = ch->scan_type.storagebits / 8;
>> + if (ch->scan_type.repeat > 1)
>> + length = ch->scan_type.storagebits / 8 *
>> + ch->scan_type.repeat;
>> + else
>> + length = ch->scan_type.storagebits / 8;
>> bytes = ALIGN(bytes, length);
>> bytes += length;
>> }
>> if (timestamp) {
>> ch = iio_find_channel_from_si(indio_dev,
>> indio_dev->scan_index_timestamp);
>> - length = ch->scan_type.storagebits / 8;
>> + if (ch->scan_type.repeat > 1)
>> + length = ch->scan_type.storagebits / 8 *
>> + ch->scan_type.repeat;
>> + else
>> + length = ch->scan_type.storagebits / 8;
>> bytes = ALIGN(bytes, length);
>> bytes += length;
>> }
>> @@ -957,7 +974,11 @@ static int iio_buffer_update_demux(struct
>> iio_dev *indio_dev,
>> indio_dev->masklength,
>> in_ind + 1);
>> ch = iio_find_channel_from_si(indio_dev, in_ind);
>> - length = ch->scan_type.storagebits/8;
>> + if (ch->scan_type.repeat > 1)
>> + length = ch->scan_type.storagebits / 8 *
>> + ch->scan_type.repeat;
>> + else
>> + length = ch->scan_type.storagebits / 8;
>> /* Make sure we are aligned */
>> in_loc += length;
>> if (in_loc % length)
>> @@ -969,7 +990,11 @@ static int iio_buffer_update_demux(struct
>> iio_dev *indio_dev,
>> goto error_clear_mux_table;
>> }
>> ch = iio_find_channel_from_si(indio_dev, in_ind);
>> - length = ch->scan_type.storagebits/8;
>> + if (ch->scan_type.repeat > 1)
>> + length = ch->scan_type.storagebits / 8 *
>> + ch->scan_type.repeat;
>> + else
>> + length = ch->scan_type.storagebits / 8;
>> if (out_loc % length)
>> out_loc += length - out_loc % length;
>> if (in_loc % length)
>> @@ -990,7 +1015,11 @@ static int iio_buffer_update_demux(struct
>> iio_dev *indio_dev,
>> }
>> ch = iio_find_channel_from_si(indio_dev,
>> indio_dev->scan_index_timestamp);
>> - length = ch->scan_type.storagebits/8;
>> + if (ch->scan_type.repeat > 1)
>> + length = ch->scan_type.storagebits / 8 *
>> + ch->scan_type.repeat;
>> + else
>> + length = ch->scan_type.storagebits / 8;
>> if (out_loc % length)
>> out_loc += length - out_loc % length;
>> if (in_loc % length)
>> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
>> index 5629c92..ccde917 100644
>> --- a/include/linux/iio/iio.h
>> +++ b/include/linux/iio/iio.h
>> @@ -177,6 +177,12 @@ struct iio_event_spec {
>> * shift: Shift right by this before masking out
>> * realbits.
>> * endianness: little or big endian
>> + * repeat: Number of times real/storage bits
>> + * repeats. When the repeat element is
>> + * more than 1, then the type element in
>> + * sysfs will show a repeat value.
>> + * Otherwise, the number of repetitions is
>> + * omitted.
>> * @info_mask_separate: What information is to be exported that is
>> specific to
>> * this channel.
>> * @info_mask_shared_by_type: What information is to be exported
>> that is shared
>> @@ -219,6 +225,7 @@ struct iio_chan_spec {
>> u8 realbits;
>> u8 storagebits;
>> u8 shift;
>> + u8 repeat;
>> enum iio_endian endianness;
>> } scan_type;
>> long info_mask_separate;
>>
>
>
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